I use Gnus together with epop3 from Franklin Lee <flee(a)lehman.com&gt;, which in turn uses pop3 from Gnus. I like the UIDL feature because I want to leave my mail on the server after fetching. I use it on emacs-20.3.1. I would like to use it with Gnus on xemacs but the problem is, pop3.el uses password routines from ange-ftp. And xemacs uses efs instead of ange-ftp. It would be nice to have a pop3.el which works on both emacs versions. I don't know enough lisp to work on this. Maybe pop3.el could be extended to use either the ange-ftp stuff or the efs stuff depending on the emacs version.